Carburetor for internal combustion engines



2 Sheets-Sheet 1 G. R. MORTON CARBURETOR FOR INTERNAL COMBUSTION ENGINESAug. 9, 1966 Filed Oct. 50, 1963 1966 G. R. MONRTON 3,265,375

CARBURETOR FOR INTERNAL COMBUSTION ENGINES Filed Oct. 50, 1963 2Sheets-Sheet 2 Oil/r @ZM ATTOPNEVS United States Patent 3,265,375CARBURETOR FOR INTERNAL COM- BUSTION ENGINES Glenn R. Morton, 7025 SarpyAve., Omaha, Nebr. Filed Oct. 30, 1963, Ser. No. 320,097 13 Claims. (Cl.26150) This invention relates to carburetors for internal combustionengines and more particularly to a carburetor that will automaticallyadjust to varying temperatures, atmospheric pressures and enginemanifold pressures.

Substantially all internal combustion engines employ a carburetor to mixthe liquid fuel, such as gasoline, and air into an ignitable gas.Obviously the efficiency of the engine will depend on the proper mixtureof the air and liquid fuel. Most standard carburetors may be adjustedfor maximum efficiency for a given engine speed, and/ or a givenatmospheric pressure. However, most carburetors have only one generaluse control, i.e. a butterfly throttle valve in the air inlet conduit.This air flow is induced by the engine piston suction and is hereinafterreferred to as manifold pressure.

Still another objection to herebefore carburetors is objectionablebubbling or boiling of the gasoline due to high temperatures and/orengine heat.

Therefore one of the principal objects of my invention is to provide acarburetor of simplified parts that will antomatically compensate forvarying conditions of pressures and temperatures.

A further object of this invention is to provide a carburetor that willbalance its throttle position with the outside atmosphere as the enginemanifold pressure changes.

A still further object of this invention is to provide a carburetor thatwill automatically enrich the mixture of gasoline at critical enginestages of operation that require such additional fuel.

A still further object of this invention is to provide a carburetormeans that is not adversely aifected by heat bubbling of the liquidfuel.

A still further objectof this invention is to provide a carburetor thatwhile automatic in general efficient operation, is at all times underthe control of the operator.

A still further object of this invention is to provide a carburetor thatprovides rapid engine acceleration.

A still further object of this invention is to provide a carburetor thatidles perfectly.

A still further object of this invention is to provide a carburetor thatis so efiicient under all conditions that the pollution of the air fromthe engines exhaust is greatly reduced.

Still further objects of my invention is to provide a carburetor that iseconomical in manufacture and durable in use.

These and other objects will be apparent to those skilled in the art.

This invention consists in the construction, arrangements, andcombination, of the various parts of the device, whereby the objectscontemplated are attained as hereinafter more fully set forth,specifically pointed out in the claims, and illustrated in theaccompanying drawings, in which:

FIG. 1 is a perspective view of my carburetor installed on an internalcombustion engine;

FIG. 2 is an enlarged vertical sectional view of my carburetorillustrating the construction of the same;

FIG. 3 is an upper perspective view of the throttle and needle valve ofmy carburetor;

FIG. 4 is an enlarged vertical sectional view of my carburetor in aclosed port position;

Patented August 9, 1966 ice FIG. 5 is a side sectional view of thecarburetor float arm;

FIG. 6 is a perspective view of the float arm; and

FIG. 7 is a perspective view of the float.

In the drawings I have used the numeral 10 to designate theintake'manifold of the internal combustion engine and to which mycarburetor is associated and into which it communicates.

The main housing of my carburetor consists of a lower housing 12communicating with an upper housing 14. The lower housing 12 has aninternal chamber or compartrnent area 16 which is adapted to be incommunication with the intake manifold of the engine upon which the unitis to be used, such as the opening 17. The upper housing 14 has aninternal cylindrical bore 18 which, except for the throttle to bedescribed hereafter, would be in communication with the chamber 16 inthe lower housing 12. The numeral 20 designates a radial horizontalcylinder in the lower portion of the housing 12. This cylindercommunicates at its forward end with the opening 17 and at its rear endwith the outside of the carburetor. Threaded into this cylinder is acore member 22 having actuatable lugs 24. On the forward inner end ofthecore 22 is a shaft 26, having a diameter less than that of the diameterinside of the cylinder 20. Between the two ends of the shaft portion 26is a piston 28. By this structure an area 30 is provided back of thepiston 28. The number 32 designates a fixed sealing ring in the forwardend of the cylinder 20, and through which the piston 26 may reciprocate.The numeral 34 designates a coil spring embracing the shaft 26 and hasone end engaging the ring 32 and its other end engaging the forward sideof the piston 28. The purpose of this spring is to yieldingly take upany slack experienced in the looseness of the threads of the cylinder 20and core 22. The numeral 36 designates a passageway in the shaft 26having its forward end communicating with the opening 17 and its otherend communicating with the inside of the cylinder 26 just forward of thepiston 28. The numeral 38 designates a well in the top of the housing 14having its bottom communicating with the inside top of the cylinder borearea 18. The top of this well is closed by a cap screw 40 threaded intoits top area. The numeral 42 designates a passageway in the lower andupper housings 12 and 14 and has one end communicating with the insideof the well 38 and its other end communicating with the inside of thecylinder, as shown in FIG. 2. The numeral 44 designates an airpassageway in the housing 12 and cylinder 20, having one endcommunicating with the outside atmosphere and its other endcommunicating with the inside of the cylinder 20 at a point to the rearof the point where the passageway 42 communicates with the inside of thecylinder 20.

The numeral 48 generally designates the vertically slidable throttlewhich is spool shaped in that it has a downwardly and outwardlyextending lower skirt portion 50 and an outwardly extending skirtportion 52. The skirt 52 slides within the cylinder bore 18 and asealing ring 54 is imposed between the edge of the skirt 52 and bore 18.The area between the two skirts 50 and 52 communicate with the outsideatmosphere through the openings 56 that extend through the wall of thehousing 14 to create an air inlet port at the top of compartment 16. Onthe bottom center of the throttle 48 is a downwardly extending tube 58.Detachably embracing this tube 58 is the carburetor bowl 60. Thiscarburetor bowl is directly below and its top is inclosed by theunderside of the skirt 50. A coil spring 62 has one end engaging aflange 64 at the bottom of the housing 12 and its top engaging thebottom of the carburetor bowl for yieldingly holding the spool throttle48 in an upward position of its sliding movement. The numeral 66designates passageways through the lower end portion of the tube 58.These passageways are below the normal gasoline surface (designated atbroken line 68) and communicates with the inside of the carburetor bowlas shown in FIG. 4. The numeral 70 designates an upwardly extending tubeon the top center of the throttle 48. The shaft of the throttle 48 ishollow and in line with both tubes 58 and 70. Thus the tube 70 is incommunication with the tube 58 as shown in FIG. 2. The tube 70vertically slides in a bearing 72 of the upper housing port 14. A capnut 74 is threaded around the bearing 72. Threaded through the top ofthe cap nut is thimble 76. The numeral 78 designates a needle valvehaving a top head 80 slidable in the thimble 76 and a tapered stemportion 82 slidably extending through the bottom of the thimble andslidably through a valve hole seat 84 in the lower portion of the tube58. This valve hole seat is above the passageways 66, but below theskirt 50. The number 86 designates a coil spring having its lower endengaging the inside bottom of the thimble 76 and its other end engagingthe needle valve head 80 for yieldingly holding the needle valve in anupper position of its movement. An adjustable hollow stop plug 88 isthreaded into the top of the thimble 76 and above the head of the needlevalve. The area inside the upper housing and above the upper skirt 52 ofthe throttle is designated by the numeral 90. The numeral 92 designatesa passageway conduit connecting the manifold minus pressure area 16 withthe area 90 above the throttle. The numeral 94 designates a pilot valveimposed in the passageway conduit 92. This valve 94 is actuated by thecontrol rod 96. The numeral 98 designates a small bleeder passagewaycommunicating with the area between the upper and lower skirts of thethrottle 48 and the passageway conduit 92. This opening passageway 98 iscontrolled by an adjustable threaded needle valve 100 as shown in FIG.4. The numeral 102 designates a plurality of radially extendingpassageways in the lower skirt 50 of the throttle. These passagewayscommunicate with the inside hollow shaft of the throttle 48 and the area16 of the inside lower housing at the periphery of the skirt 50. To slowdown the rapid downward movement of the throttle when in use, a smallspring loaded relief valve 104 is imposed in a passageway 106 connectingthe area 16 with the passageway conduit 92. Thus if any air were to rushdown the conduit 94 after the valve 94 were closed, the valve 104 wouldyieldingly permit the passage of air into the area 16 and slow thedownward movement of the throttle 48. Slidably embracing the tube 58 andinside the bowl 60 is a float 108. The numeral 110 designates a splitfork float arm having its upper end hinged and its free ends riding ontop of the float 108. The numeral 112 designates a hollow valve housingextending through the skirt 50 and having its lower end communicatingwith the inside of the carburetor bowl above the arm 110. The numeral114 designates a valve stem in the valve housing having its lower endresting on the top of the float arm 110. The numeral 116 designates aflexible conduit having one end communicating with the inside of thevalve housing 112 and its other end adapted to be operatively incommunication with a source of gasoline or like. By this arrangement ofparts when the float drops, due to a shortage of fluid in the carburetorbowl, the arm 110 will drop and this opens the valve stem 114 andpermits fuel to pass from the conduit 116 into the carburetor bowl. Asthe bowl fills, the float will rise and shut off the valve means. Thusthe carburetor bowl will be automatically maintained with a constantlevel of liquid.

The practical operation of my carburetor is as follows:

The speed of the engine to which my carburetor is attached may becontrolled by'either the adjustable rotation of the core 22 or by thelever 96. If the core 22 is used, the lever 96 may be used for fineadjustment, or if the lever 96 is used the core 22 may be used for fineadjustment. In either case the carburetor action is the same. First, Iwill describe the use of the lever 96 as the chief control means.

The throttle 48 is vertically floatable, but is controlled by enginesuction and atmospheric pressures working in conjunction with theyieldable support spring 62. The area between the two skirts of thethrottle 48 is exposed to the outside atmosphere and in some experimentsI permitted air to leak around the edge of the upper skirt 52 into thearea 90. However, if there be any leakage, and with the valve 94 open,any such air leakage would be pulled into the engine intake manifold asfast as it came in. When the engine is at idling speed the manifoldvacuum will exist in the area 16, passageway conduit 92 and area abovethe throttle, thus pulling the throttle to an upper position of itsmovement. With the throttle in such an upward position, it will moreclosely embrace the needle valve stem 82, which is tapered as it extendsdownwardly, and less gasoline will pass through the throttle passageways102. The course of the gasoline will be drawn by the suction of themanifold pressure through the passageways 66, into the lower end of thetube 58, thence up through the valve seat hole 84, thence into the upperend of the tube 58 and into the inside of the shaft of the throttle 48,thence through the passageways 102 and then into the air stream passingthe periphery of the lower skirt of the throttle. As the acceleratorlever 96 is progressively moved to further progressively close the valve94 there will be less vacuum exerted on the top of the throttle and thesuction of the manifold pressure below the throttle will pull thethrottle downwardly thereby increasing the flow of gasoline around theneedle valve and through the opening 84. If the accelerator rod isquickly actuated to increase engine speed, the manifold pressure isquickly dropped and there is a tendency for the throttle to quickly movedownwardly and then objectionably bounce upwardly. This tends to cause ahesitation of the engine as the gasoline catches up with the volume ofair. This objectionable possibility has been overcome by the herebeforediscussed valve 104. The chief source of air into the passageway conduit94 and the area above the throttle is through the adjustable passagewayopening 98. The O-ring 54 is for preventing substantially all bleedingof air around the periphery of the skirt 52 of the throttle. Theadjustment of the needle valve is used to smooth out the carburetor forall speeds of a given engine. When the throttle is moved downwardly by aminus atmospheric pressure in the area 16, the air will flow past theperipheral edge of the skirt 50 of the throttle and will suck gasolinefrom the passageways 102, and atomize it. The spring loaded needle valve78 may move upwardly or downwardly five or six thousandths of an inch.It will raise with pressures of twenty-five inches or more. From theforegoing it will be appreciated that the throttle is controlled by aminus pressure below it versus a controlled pressure above it. When thethrottle is in an up position, the area 16 is substantially closed tothe outside atmosphere and as it progressively lowers, the communicationbetween the area 16 and the outside atmosphere progressively increases.When the engine starts, the vacuum will pull the needle valve down, thuseliminating gasoline flooding. The action in conjunction with thethrottle determines the proper richness of the gas relative to the airratio. This automatic adjustment of parts insures the proper mixture atall speeds and atmospheric conditions. This proper mixture is maintainedregardless of the throttle position. If the core 22 is used as the chiefregulator, the action is the same. Thus, although the throttle does havea floating automatic action due to pressures or lack of pressures abovethe skirt 52 versus pressures or lack of pressures below the skirt 52,the general manual control of the carburetor will be the regulation ofthe pressure above the skirt 52. This is accomplished by the rotation ofthe core 22.. In FIG. 1 and FIG. 4, the piston portion 28 is shown atextreme positions merely for purposes of illustration. In actualpractice the core 22 may be turned only slightly to move the pistonportion 28 to positions when it will permit the passageway 42 tocommunicate with the passageway 36 or communicate with the passageway44. When the piston portion 28 is for ward of the passageway 42, thearea 90 will be of atmospheric pressure because the area 96 will be incommunication with the outside atmosphere via the well 38, passageway42, area 30, and passageway 44. Under such circumstances the throttle 48will be in a lowered position. If the core 22 is rotated to a positionsuch as shown in FIG. 4, suction minus pressure will exist in the area99, and the throttle 48 will be in an upward position by virtue of themanifold minus pressure drawing through the passageway 36, passageway42, well 38 and area 90. The core 22 may be rotated to an adjustedposition where the piston 28 will permit adjustable communicationbetween the manifold suction pressure and the passageway 42, thereby, inbounds, controlling the floating position of the throttle. Bycontrolling the general position of the throttle, the speed of theengine will be controlled. The area 16 which is in the lower housingportion 12 and the lower part of the housing 14, should have first anincreasing diameter and then a decreasing diameter as shown in FIG. 2,so that when the throttle is in a middle position of its reciprocation,the greater will be the air passing through the carburetor. The needlevalve 78 may be easily adjustable for fine tuning of the engine by thecap nut 75 and cap screw 88.

Some changes may be made in the construction and arrangement of mycarburetor for internal combustion engines without departing from thereal spirit and purpose of my invention, and it is my intention to coverby my claims, any modified forms of structure or use of mechanicalequivalents which may be reasonably included within their scope.

I claim:

1. In a carburetor for internal combustion engines,

a carburetor housing having an upper bore and a lower compartment area;

said lower compartment area adapted to be in communication with theintake manifold of an internal combustion engine,

throttle valve means slidably mounted in the bore of said housing andadapted to variably restrict the entrance to said lower compartmentarea,

an air inlet port in said housing communicating with the compartmentarea of said housing above the en.- trance to said lower compartmentarea,

a fluid bowl on said throttle valve means,

a conduit having one end communicating with the inside of said fluidbowl and its other end adapted to be in communication with a source ofengine fuel,

a combustible fluid passageway in said throttle valve meanscommunicating with the inside of said fluid bowl,

means mounting a needle valve stem extendinginto the passageway of saidthrottle valve means,

at least one fluid exit passageway in said throttle valve means havingone end operatively connected to the said passageway of said throttlevalve means and its other end communicating with the inside of the lowercompartment area of said carburetor housing,

a conduit having one end communicating with the lower compartment areaof said carburetor housing and its other end communicating with theinside of the bore of said carburetor housing at a position above thesaid throttle valve means,

and a manually controllable valve means imposed in said last mentionedconduit.

2. In a carburetor for internal combustion engines,

a carburetor housing having an upper bore and a lower compartment area;

said lower compartment area adapted to be in com- 6 munication with theintake manifold of an internal combustion engine,

throttle valve means slidably mounted in the bore of said housing andadapted to variably restrict the entrance to said lower compartmentarea,

an air inlet port in said housing communicating with the compartmentarea of said housing above the entrance to said lower compartment area,

a fluid bowl on said throttle valve means,

a conduit having one end communicating with the inside of said fluidbowl and its other end adapted to be in communication with a source ofengine fuel,

a combustible fluid passageway in said throttle valve communicating withthe inside of said fluid bowl,

means mounting a needle valve stem extending into the passageway of saidthrottle valve means,

at least one fluid exit passageway in said throttle valve means havingone end operatively connected to the said passageway of said throttlevalve means and its other end communicating with the inside of the lowercompartment area of said carburetor housing,

a conduit having one end communicating with the lower compartment areaof said carburetor housing and its other end communicating with theinside of the bore of said carburetor housing at a position above thesaid throttle valve means,

a manually controllable valve means imposed in said last mentionedconduit,

and a passageway operatively connecting the outside atmosphere with theinside of the bore of said carburetor at a position above said throttlevalve means.

3. In a carburetor for internal combustion engines,

a carburetor housing having an upper bore and a lower compartment area;

said lower compartment area adapted to be in communication with theintake manifold of an internal combustion engine,

throttle valve means slidably mounted in the bore of said housing andadapted to variably restrict the entrance to said lower compartmentarea,

an air inlet port in said housing communicating with the compartmentarea of said housing above the entrance to said lower compartment area,

a fluid bowl on said throttle valve means,

a conduit having one end communicating with the in side of said fluidbowl and its other end adapted to be in communication with a source ofengine fuel,

a combustible fluid passageway in said throttle valve meanscommunicating with the inside of said fluid bowl,

means mounting a needle valve stem extending into the passageway of saidthrottle valve means,

at least one fluid exit passageway in said throttle valve means havingone end operatively connected to the said passageway of said throttlevalve means and its other end communicating with the inside of the lowercompartment area of said carburetor housing,

a conduit having one end communicating with the lower compartment areaof said carburetor housing and its other end communicating with theinside of the bore of said carburetor housing at a position above thesaid throttle valve means,

a manually controllable valve means imposed in said last mentionedconduit,

a passageway operatively connecting the outside atmosphere with theinside of the bore of said carburetor at a position above said throttlevalve means,

and an adjustable valve means in said last mentioned passageway.

4. In a carburetor for internal combustion engines,

a carburetor housing having an upper bore and a lower compartment area;

said lower compartment area adapted to vbe in communication'with theintake manifold of an internal combustion engine,

throttle valve means slidably mounted in the bore of said housing andadapted to variably restrict the entrance to said lower compartmentarea,

an air inlet port in said housing communicating with the compartmentarea of said housing above the entrance to said lower compartment area,

a fluid bowl on said throttle valve means,

a conduit having one end communicating with the inside of said fluidbowl and its other end adapted to be in communication with a source ofengine fuel,

a combustible fluid passageway in said throttle valve meanscommunicating with the inside of said fluid bowl,

means mounting a needle valve stem extending into the passageway of saidthrottle valve means,

at least one fluid exit passageway in said throttle valve means havingone end operatively connected to the said passageway of said throttlevalve means and its other end communicating with the inside of the lowercompartment area of said carburetor housing,

a conduit having one end communicating with the lower compartment areaof said carburetor housing and its other end communicating with theinside of the bore of said carburetor housing at a position above thesaid throttle valve means,

a manual-1y controllable valve means imposed in said last mentionedconduit,

a passageway operatively connecting the outside atmosphere with theinside of the bore of said carburetor at a position above said throttlevalve means,

an adjustable valve means in said last mentioned passageway,

and a means for yieldingly holding said throttle valve means in anupward position.

5. In a carburetor for internal combustion engines,

a carburetor housing having an upper bore and a lower compartment area;

said lower compartment area adapted to be in communication with theintake manifold of an internal combustion engine,

throttle valve means slidably mounted in the bore of said housing andadapted to variably resist the entrance to said lower compartment area,

an air inlet port in said housing communicating with the upper area ofthe compartment area of said housing above the entrance to said lowercompartment area,

a fluid bowl on said throttle valve means,

a conduit having one end communicating with the inside of said fluidbowl and its other end adapted to be in communication with a source ofengine fuel,

a combustible fluid passageway in said throttle valve meanscommunicating with the inside of said fluid 'bowl,

means mounting a needle valve stem extending into the passageway of saidthrottle valve means,

'at least one fluid exit passageway in said throttle valve means havingone end operatively connected to the said passageway of said throttlevalve means and its other end communicating with the inside of the lowercompartment area of said carburetor housing,

a conduit having one end communicating with the lower compartment areaof said carburetor housing and its other end communicating with theinside of the bore of said carburetor housing at a position above thesaid throttle valve means,

and a manually controllable valve means imposed in said last mentionedconduit.

6. In a carburetor for internal combustion engines,

a carburetor housing having an upper bore and a lower compartment area;

said lower compartment area adapted to be in communication with theintake manifold of an internal combustion engine,

throttle valve means slidably mounted in the bore of said housing andadapted to variably restrict the entrance to said lower compartmentarea,

an air inlet :port in said housing communicating with the compartmentarea of said housing above the entrance to said lower compartment area,

a fluid bowl on said throttle valve means,

a conduit having one end communicating with the inside of said fluidbowl and its other end adapted to be in communication with a source ofengine fuel,

a combustible fluid passageway in said throttle valve meanscommunicating with the inside of said fluid bowl,

means mounting a needle valve stem extending into the passageway of saidthrottle valve means,

at least one fluid exit passageway in said throttle valve means havingone end operatively connected to the said passageway of said throttlevalve means and its other end communicating with the inside of the lowercompartment area of said carburetor housing,

a conduit having one end communicating with the lower compartment areaof said carburetor housing and its other end communicating with theinside of the bore of said carburetor housing at a position above thesaid throttle valve means,

a manually controllable valve means imposed in said last mentionedconduit,

a passageway operatively connecting the outside atmosphere with theinside of the bore of said carburetor at a position above said throttlevalve means,

an adjustable valve means in said last mentioned passageway, t.

and a means for yieldingly holding said throttle va'lv means in anupward position;

said throttle valve means being in the general form of a spool having alower skirt portion and a spaced apart upper skirt portion.

7. In a carburetor for internal combustion engines,

a carburetor housing having an upper bore and a lower compartment area;

said lower compartment area adapted to be in communication with theintake manifold of an internal combustion engine,

throttle valve means slidably mounted in the bore of said housing andadapted to variably restrict the entrance to said lower compartmentarea,

an air inlet port in said housing communicating with the compartmentarea of said housing above the entrance to said lower compartment area,

a fluid bowl on said throttle valve means,

a conduit having one end communicating with the inside of said fluidbowl and its other end adapted to be in communication with a source ofengine fuel,

a combustible fluid passageway in said throttle valve meanscommunicating with the inside of said fluid bowl,

means mounting a needle valve stem extending into the passageway of saidthrottle valve means,

at least one fluid exit passageway in said throttle valve means havingone end operatively connected to the said passageway of said throttlevalve means and its other end communicating with the inside of the lowercompartment area of said carburetor housing,

a conduit having one end communicating with the lower compartment areaof said carburetor housing and its other end communicating with theinside of the bore of said carburetor housing at a position above thesaid throttle valve means,

a manually controllable valve means imposed in said last mentionedconduit,

a passageway operatively connecting the outside atmosphere with theinside of the bore of said carburetor at a position above said throttlevalve means,

an adjustable valve means in said last mentioned passageway,

and a means for yieldingly holding said throttle valve means in anupward position;

said throttle valve means being in the general form of a spool having alower skirt portion and a spaced apart upper skirt portion with saidfluid exit passageway or passageways extending through said lower skirtportion.

8. In a carburetor for internal combustion engines,

a carburetor housing having an upper bore and a lower compartment area;

said lower compartment area adapted to be in communication with theintake manifold of an internal combustion engine,

throttle valve means slidably mounted in the bore of said housing andadapted to variably restrict the entrance to said lower compartmentarea, I

an air inlet port in said housing communicating with the compartmentarea of said housing above the entrance to said lower compartment area,

a fluid bowl on the bottom of said throttle valve means,

a conduit having one end communicating with the inside of said fluidbowl and its other end adapted to be in communication with a source ofengine fuel,

a combustible fluid passageway in said throttle valve meanscommunicating with the inside of said fluid bowl,

means mounting a needle valve stem extending into the passageway of saidthrottle valve means,

at least one fluid exit passageway in said throttle valve means havingone end operatively connected to the said passageway of said throttlevalve means and is other end communicating with the inside of the lowercompartment area of said carburetor housing,

a conduit having one end communicating with the lower compartment areaof said carburetor housing and its other end communicating with theinside of the bore of said carburetor housing at a position above thesaid throttle valve means,

and a manually controllable valve means imposed in said last mentionedconduit.

9. In a carburetor for internal combustion engines,

a carburetor housing having an upper bore and a lower compartment area;

said lower compartment area adapted to be in communication with theintake manifold of an internal combustion engine,

throttle valve means slidably mounted in the bore of said housing andadapted to variably restrict the entrance to said lower compartmentarea,

an air inlet port in said housing communicating with the compartmentarea of said housing above the entrance to said lower compartment area,

a fluid bowl on said throttle valve means,

a flexible conduit having one end communicating with the inside of saidfluid bowl and its other end adapted to be in communication with asource of engine fuel,

a combustible fluid passageway in said throttle valve meanscommunicating with the inside of said fluid bowl,

means mounting a needle valve stem extending into the passageway of saidthrottle valve means,

at least one fluid exit passageway in said throttle valve means havingone end operatively connected to the said passageway of said throttlevalve means and its other end communicating with the inside of the lowercompartment area of said carburetor housing,

a conduit having one end communicating with the lower compartment areaof said carburetor housing and its other end communicating with theinside of the bore of said carburetor housing at a position above thesaid throttle valve means,

and a manually controllable valve means imposed in said last mentionedconduit.

10. In a carburetor for internal combustion engines,

a carburetor housing having an upper bore and a lower compartment area;

said lower compartment area adapted to be in communication with theintake manifold of an internal combustion engine,

throttle valve means slidably mounted in the bore of said housing andadapted to variably restrict the entrance to said lower compartmentarea,

an air inlet port in said housing communicating with the compartmentarea of said housing above the entrance to said lower compartment area,

a fluid bowl on said throttle valve means,

a flexible conduit having one end communicating with the inside of saidfluid bowl and its other end adapted to be in communication with asource of engine fuel,

a combustible fluid passageway in said throttle valve meanscommunicating with the inside of said. fluid bowl,

means mounting a needle valve stem extending into the passageway of saidthrottle valve means,

at least one fluid exit passageway in said throttle valve means havingone end operatively connected to the said passageway of said throttlevalve means and its other end communicating with the inside of the lowercompartment area of said carburetor housing,

a conduit having one end communicating with the lower compartment areaof said carburetor housing and its other end communicating with theinside of the bore of said carburetor housing at a position above thesaid throttle valve means,

a manually controllable valve means imposed in said last mentionedconduit,

and a float valve means for controlling the amount of engine fuel insaid bowl.

11. In a carburetor for internal combustion engines,

a carburetor housing having an upper bore and a lower compartment area;

said lower compartment area adapted to be in communication with theintake manifold of an internal combustion engine,

throttle valve means slidably mounted in the bore of said housing andadapted to variably restrict the entrance to said lower compartmentarea,

an air inlet port in said housing communicating with the compartmentarea of said housing above the entrance to said lower compartment area,

a fluid bowl on said throttle valve means,

a conduit having one end communicating with the inside of said fluidbowl and its other end adapted to be in communication with a source ofengine fuel,

a combustible fluid passageway in said throttle valve meanscommunicating with the inside of said fluid bowl at a point below thenormal surface of engine fuel in said bowl,

means mounting a needle valve stem extending into the passageway of saidthrottle valve means,

at least one fluid exit passageway in said throttle valve means havingone end operatively connected to the said passageway of said throttlevalve means and its other end communicating with the inside of the lowercompartment area of said carburetor housing,

a conduit having one end communicating with the lower compartment areaof said carburetor housing and its other end communicating with theinside of the bore of said carburetor housing at a position above thesaid throttle valve means,

and a manually controllable valve means imposed in said last mentionedconduit. 7

12. In a carburetor for internal combustion engines,

a carburetor housing having an upper bore and a lowe compartment area;

said lower compartment area adapted to be in communication with theintake manifold of an internal combustion engine,

throttle valve means slidably mounted in the 'bore of 1 1 said housingand adapted to variably restrict the entrance to said lower compartmentarea,

an air inlet port in said housing communicating with the compartmentarea of said housing above the entrance to said lower compartment area,

a fluid bowl on said throttle valve means,

a flexible conduit having one end communicating with the inside of saidfluid "bowl and its other end adapted to be in communication with asource of engine fuel,

a combustible fluid passageway in said throttle valve meanscommunicating with the inside of said fluid bowl at a point below thenormal surface of engine fuel in said bowl,

means mounting a needle valve stem extending into the passageway of saidthrottle valve means,

at least one fluid exit passageway in said throttle valve means havingone end operatively connected to the said passageway of said throttlevalve means and its other end communicating with the inside of the lowercompartment area of said carburetor housing,

a conduit having one end communicating with the lower compartment areaof said carburetor housing and its other end communicating with theinside of the bore of said carburetor housing at a position above thesaid throttle valve means,

a manually controllable valve means imposed in said last mentionedconduit,

and a float valve means for controlling the amount of engine fuel insaid bowl.

13. In a carburetor for internal combustion engines,

a carburetor housing having a bore and a compartment area,

said compartment area adapted to be in communication with the intakemanifold of an internal combustion engine,

throttle valve means slidably mounted in the bore of said housing andadapted to variably restrict the entrance to said compartment area,

a fluid bowl on said throttle valve means,

a first conduit having one end communicating with the inside of saidfluid bowl and its other end adapted to be in communication with asource of engine fuel,

a combustible fluid passage-way in said throttle valve meanscommunicating with the inside of said fluid bowl,

a needle valve stem extending into the passageway of said throttle valvemeans,

at least one fluid exit passageway in said throttle valve means havingone end operatively connected to the said passageway of said throttlevalve means and its other end communicating with the inside of thecompartment area of said carburetor housing,

said housing having an air inlet means extending thereinto above theentrance to said compartment area,

a second conduit having one end communicating with the compartment areaof said carburetor housing and its other end communicating with theinside of the bore of said carburetor housing,

and a manually controllable valve means imposed in said second conduit.

References Cited by the Examiner UNITED STATES PATENTS 1,862,978 6/1932Norris 2615O 2,167,892 8/1939 Kent et a1. 2615O 2,887,309 5/1959 Raynor261 FOREIGN PATENTS 435,768 9/1935 Great Britain.

515,040 11/ 1939 Great Britain.

528,939 ll/ 1940 Great Britain.

HARRY B; THORNTON, Primary Examiner.

T. R. MILES, Assistant Examiner.

1. IN A CARBURETOR FOR INTERNAL COMBUSTION ENGINES, A CARBURETOR HOUSINGHAVING AN UPPER BORE AND A LOWER COMPARTMENT AREA; SAID LOWERCOMPARTMENT AREA ADAPTED TO BE IN COMMUNICATION WITH THE INTAKE MANIFOLDOF AN INTERNAL COMBUSTION ENGINE, THROTTLE VALVE MEANS SLIDABLY MOUNTEDIN THE BORE OF SAID HOUSING AND ADAPTED TO VARIABLY RESTRICT THEENTRANCE TO SAID LOWER COMPARTMENT AREA, AN AIR INLET PORT IN SAIDHOUSING COMMUNICATING WITH THE COMPARTMENT AREA OF SAID HOUSING ABOVETHE ENTRANCE TO SAID LOWER COMPARTMENT AREA, A FLUID BOWL ON SAIDTHROTTLE VALVE MEANS, A CONDUIT HAVING ONE END COMMUNICATION WITH THEINSIDE OF SAID FLUID BOWL AND ITS OTHER END ADAPTED TO BE INCOMMUNICATION WITH A SOURCE OF ENGINE FUEL, A COMBUSTIBLE FLUIDPASSAGEWAY IN SAID THROTTLE VALVE MEANS COMMUNICATING WITH THE INSIDE OFSAID FLUID BOWL,